do this Brook since the battery pull didn't work: make sure you have Blackberry Desktop Manager installed to your PC, then go to http://www.att.com/bbdownloads
and choose your BB model from the drop down list, follow those directions to get it downloaded to the PC (make sure to choose Save when it gives you the choice of save or run). Install the file. Go ahead and try what sgtcasey suggested on how to get desktop manager to connect to your BB successfully. If that works then procede to the application loader icon and follow the steps there.
If preferred I can email you the directions too.